Telegraphy.



I. KITSBE.

TELEGRAPHY. APPLICATION FILED JAN. 19, 1906. RENEWED JAN. 13, 1914.

1,090,217, Patented Mar.17,1914.

coumnu I'LANUGIPAI'H co. WWHIMITON, IL L @TAIES PATENT OIFFIQE,

ISIDOR KITS-EB. OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR. BY DIRECT AND MESNE ASSIGNMENTS, T0 AMERICAN TELEPHONE AND TELEGRAPH COMPANY, OF NEl/V YORK, N. Y., A CORPORATION OF NEW YORK.

TELEGRAPI-IY.

eonora.

Specification of Letters Patent.

atcnted Mar. TH, Matt.

Renewed January 13. 1914. Serial No. 811.903.

To 077 ui/zo/a it may crmccra lie it known that I, Isinon Krrsnn, citizen ot the United States, residing at Phil- :nilelphia, in the county o'l. Philadelphia and thate o't' lcnnsylvania, have invented certain new and useful Improvements in Tolcgraphy, of which the :iollowing is a speciti ation.

hairy invention relates to an improvement in telee'raphy and has more special reference to the means tor transmittiiur impulses in accm'dance with the Morse alpha'oet. The invention. is more specially applicable to lines of great capacity, such for instance as mater-ground or submarine cables. The transmission of induced current-s, due to the making and breaking of a primary source, was found to be inapplicable to the transi'nission. of submarine cables and was, therefore. discontinued on all such lines where the insulation has to be preserved and where such induced currents are liable to injure such insulation. In my experiments, I have tound that even it it is impossible to transmit speech over such lines as submarine cables, it is possible to transmit impulses due to the variation of a resistance, such as a microphonic tnmsu'iittcr, it' the change in the resistance in substantially alike For a shorter or longer time. I, therefore, have recourse t an arrangement substantially as illus trated in the drawing, described in this application, and more specially pointed out in the claim following this specification.

I have illustrated in the drawing one part ot a cable emln'acingr the usual arrangement "For duplexing the same; but it is obvious that this arrangement may also be used on lines with large capacity without duplexine' the same.

This drawing: illustrates in diagrammatic view my invention and A designates the line: C the bridge-wires; B the artificial cable; Z the ground. So to the arrangement is exactly the same as now practised on most of the long distance submarine cables, but instead of using, the double key, as now employed, and of using for each key a (litteront pole of a source of current, I have recourse to the following arrangement: I use a source of current locally connected to a resistance adapted to be varied and connecting the circuit of said resistance to the pri mary of an inductorium, the secondary of which is connected in series to the line proper. I also ma kc use of a second circuit embracing a source oi current, a transmittlllgi' key, such as an ordinary Morse key, and means to vary the resistance with the aid oi an clcctromagmet inserted in said circuit.

In the drawing); the source of current connected in the first named circuit is desim uated by K, the variable resistance by -I; this variable resistance is here illustrated as one of the usual microphonic transmitters and is here provided with the usual. transmitting mouthpiece; the primary of the inductorium is designated by the letter II and the secondary by the letter (in I have found that in accordaiu'e with the length of the line, it is best to vary the secondary and I have shown here one way in which to change the connection of said secondary with the aid oi the switch I. This secondary is illustrated as to consist oi two parts adapted to be connected with the aid of the switch. either in multiple are or series as to each other. The second local circuit embraces a source ct current, N. the vibrati'rrg magnet I), and the key 0. The vilnating magnet L is provided here with a clapper M and this clapper is adapted to tap the mouth-piece oi. the resistance J. In the cross wire o the bridge is inserted the condenser D and the resistance E. This resistance is adapted to be varied accordinrr to requirements with the aid of. the switch I. in said line is also inserted the telephonic receiver F.

The operation of this device is as tollows: As long as the key 0 is open. the vibrating magnet L is inoperative and the resistance J will. therefore. remain stationary. Fihould an operator desire to transmit messages in accordance with the Morse alphabet. then he depresses the key in the usual manner: a short time or a dot and a lonn'er time for a dash. During the time oi the depression of the key. the magnet I, becomes operative and the clapper of same will tap on the mouthpiece of the resistance '7. therebv altcrinQ' this resistance and this will result in a variable current flowing throturh the primary II. inducino" thou impulses in the sec-- ondary G. These impulses will ilow over the line and will make perative the ear-phone F for a longer or shorter time. in a cordance with the time-unit that the key 0 is means to vary automatically said resistance by the depression of the key and means to impress thereby upon the line of transmission, a series of impulses of alternating p0- larity, said means embracing a series 0 coils and means to change the connection of said coils as to each other and the line.

In testimony whereof I afi iX my signature in presence of two vvitnesses.

ISIDOR KITSEE.

Witnesses MARY C. SMITH, ALVAH RITTnNHoUsn.

Copies of this patent may be obtained for five cents each, by addressing the Washington, D. 0.

Commissioner of Patents, 

